1 、 design optimization of steel silo
1) difficult to discharge: perfect design of the basic waterproof structure, strict foundation treatment requirements, pneumatic conveying and air pressure balance of the air must be strictly dried, and the wall airtight should be strictly controlled. And try to use the gallery at the bottom of the ground water level. It is necessary to design the sealing valve when the blanking is out of order and it is difficult to discharge the material so as to realize the maintenance and replacement of the blanking port. Design and spare emergency discharge through the material, so that the safety clearance of library, difficult to discharge fault handling accident compaction etc..
2) the inclination of Bin: rigid foundation and rigid foundation are adopted preferentially to ensure the material is uniformly piled up, and the single point discharging method is preferred. Although multi-point discharge has its advantages, it is easy to cause material deflection because of human error or some failure of material outlet. Multi point discharge can with the weighing and metering system corresponding to ensure the discharge amount of the same material, thus preventing the partial load, but due to the cumulative error statistics, and misoperation, the possibility of partial load is actually very high, its main advantage is that a large number of materials stored in the warehouse due to not all outlet fault at the same time, to reduce the workload and difficulty of the Qing Dynasty, for single point material has outstanding advantages. In addition, the discharge rate of multi-point discharge is higher. Under the condition of soft soil or large cost of foundation treatment, the allowable settlement foundation can be adopted, but the rigid non settlement foundation should be adopted in areas with high soil bearing capacity.
Therefore, if the allowable settlement basis is adopted, a single point discharge system must be provided to prevent partial load in the bin, and an emergency discharge channel and system shall be set up. If the rigid non settlement foundation is adopted, the multi-point and multi corridor discharging system can be adopted, and a clear storage channel is also required. No matter what kind of material, which should give priority to the use of gravity based material, to reduce the use of energy consumption and maintenance costs, and power to flow out as material;
3) design of silo should keep enough safety margin, and the temperature stress and discharging pressure change of the fatigue limit checking, to consider the requirements xiacang material deflection stability and strength. The storehouse should be designed according to a certain negative pressure, maximum snow load, maximum wind load and internal material skew storage. These four kinds of loads work together to design. The only way to do this is to be safe. Normally, because of pressure equilibrium, bin does not appear negative pressure exceed the standard, but due to the failure of air pressure balance system may occur, and not easy to timely detect, even if there is a detection alarm device is long after the bad work, caused the accident. Therefore, the design should be designed according to the most unfavorable load combinations.
